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Why in the the last termsare written as(n-2)^2+(n-1)^2+n^2 and (1-2)(1+2)+(3-4)(3+4)....=-(1+2+3...

Why in the the last termsare written as(n-2)^2+(n-1)^2+n^2 and (1-2)(1+2)+(3-4)(3+4)....=-(1+2+3...

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Grade:12

2 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
3 years ago
Dear student

Please ask the question clearly and,
(n-2)^2+(n-1)^2+n^2 is written as(n-2)^2-(n-1)^2+n^2

Regards
Vikas TU
14149 Points
3 years ago
Dear student 
Question is not clear 
Please attach an image, 
We will happy to  help you 
Good Luck
Cheers

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